NetBeans module system hack allowing you to retroactively declare your module a “friend” of another module offering a restricted API.
If using Maven, just add a dependency on org.netbeans.contrib.yenta:api to your module project (nbm packaging). If using Ant you will need to download the NBM from Maven Central and make an external cluster.
To activate Yenta, see the Javadoc for org.netbeans.contrib.yenta.Yenta.
For discussion of why this tool is necessary, see: NBM Package Stability: Usage from external modules